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Ultrasonic diagnostic system

a diagnostic system and ultrasonic technology, applied in diagnostics, medical science, instruments, etc., can solve problems such as difficulty in adjusting a phase with good precision, and achieve the effect of high precision

Inactive Publication Date: 2006-11-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides an ultrasonic diagnostic system that can phase a received signal with high precision. The system includes electroacoustic conversion means, a sub-beam former, a main beam former, and a delay means. The sub-beam former generates signals with different polarities and adds them to create a first and second signal with different polarities. The delay means imparts a delay time difference of a quarter of one period of the received signal between the first and second signals. The system can switch between a fundamental video and a harmonic video. The delay means can switch between a quarter of one period of the received signal and a quarter of one period of the harmonic video. The system can also include a phase shift means composed of phase shift circuits in two stages to achieve a high-precision phase shift. The technical effect of the invention is to improve the precision of ultrasonic diagnostic systems for phasing received signals."

Problems solved by technology

However, in the conventional ultrasonic diagnostic system, there is the following problem: in order to shift the phase of a received signal, ±45-degree (±π / 4) phase shifters in two channels are used, which makes it difficult to adjust a phase with good precision.

Method used

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Examples

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first embodiment

[0033]FIG. 1A is a block diagram showing one exemplary configuration of a receiving section in an ultrasonic diagnostic system according to a first embodiment of the present invention.

[0034] In FIG. 1A, vibrators 1 to 4 are composed of electroacoustic transducers, and convert an acoustic echo signal to a received signal. The vibrators 1 and 2 constitute a sub-array 5, the vibrators 3 and 4 constitute a sub-array 6, and the sub-arrays 5 and 6 constitute a two-dimensional array 7. Although only the vibrators 1 to 4 are illustrated in FIG. 1A, actually, a number of vibrators are arranged two-dimensionally as shown in FIG. 1B.

[0035] Amplifying sections 8, 9 respectively output a non-inverted output signal (+) and an inverted output signal (−) of the received signals from the vibrators 1, 2. Variable amplitude sections 10, 11 are connected to the amplifying section 8 via a cross point switch 81, and variable amplitude sections 12, 13 are connected to the amplifying section 9 via a cros...

second embodiment

[0054]FIG. 2 is a block diagram showing an exemplary internal configuration of a sub-beam former in a receiving section in an ultrasonic diagnostic system according to a second embodiment of the present invention. In the present embodiment, the sub-beam former 16 shown in FIG. 1 referred to in the description of the first embodiment is replaced by a sub-beam former 26 shown in FIG. 2. The remaining configuration is the same as that of the first embodiment.

[0055] In FIG. 2, the amplifying sections 8, 9 respectively output a non-inverted output signal (+) and an inverted output signal (−) of received signals. The variable amplitude sections 10, 11 are connected to the amplifying section 8 via the cross point switch 81, and the variable amplitude sections 12, 13 are connected to the amplifying section 9 via the cross point switch 91. The output signals of the variable amplitude sections 10, 12 are added, and the added signal (first signal) is supplied to the variable delay section 24....

third embodiment

[0060]FIG. 3 is a block diagram showing an exemplary internal configuration of a sub-beam former in a receiving section in an ultrasonic diagnostic system according to a third embodiment of the present invention. In the present embodiment, the sub-beam former 16 shown in FIG. 1 referred to in the description of the first embodiment is replaced by a sub-beam former 36 shown in FIG. 3. The remaining configuration is the same as that of the first embodiment.

[0061] In FIG. 3, the amplifying sections 8, 9 respectively output a non-inverted output signal (+) and an inverted output signal (−) of received signals. The variable amplitude sections 10, 11 are connected to the amplifying section 8 via the cross point switch 81, and the variable amplitude sections 12, 13 are connected to the amplifying section 9 via the cross point switch 91. The output signals of the variable amplitude sections 10, 12 are added, and the added signal (first signal) is supplied to a phase shifter 34. Furthermore...

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Abstract

An ultrasonic diagnostic system capable of phasing a received signal from an electroacoustic transducer arranged two-dimensionally with high precision is provided. The ultrasonic diagnostic system includes a sub-beam former (16) having amplifying sections (8, 9) for amplifying received signals of vibrators (1, 2), variable amplitude sections (10 to 13) for controlling amplitudes of an inverted output signal and a non-inverted output signal from the amplifying sections, a fixed-delay section (14) for imparting a delay time of a quarter of one period of the received signal to an added signal of the variable amplitude section, and an additing section (15) for adding the added signal of the variable amplitude section to an output signal of the fixed delay section, and a sub-beam former (17) having the same configuration as that of the sub-beam former (16), with respect to the received signals of the vibrators (3, 4), wherein the output signals from the sub-beam formers (16, 17) are subjected to delay addition by a main beam former (18).

Description

TECHNICAL FIELD [0001] The present invention relates to an ultrasonic diagnostic system that has a two-dimensional array in which vibrators are arranged, and scans a subject three-dimensionally. BACKGROUND ART [0002] As shown in FIG. 7, a conventional ultrasonic diagnostic system includes a two-dimensional array 107 in which a sub-array 105 composed of vibrators 101, 102, and a sub-array 106 composed of vibrators 103, 104 are arranged two-dimensionally. Received signals from the vibrators 101, 102 constituting the sub-array 105 respectively are input to amplifying sections 108, 109, and the amplifying sections 108, 109 output a non-inverted output signal (+) and an inverted output signal (−). The non-inverted output signal (+) and the inverted output signal (−) from the amplifying section 108 respectively are supplied to variable amplitude sections 110, 111 via a cross point switch 181, and output signals thereof are added to be input to a +45-degree phase shifter 114. [0003] Furthe...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61B8/14A61B8/00G10K11/34
CPCG10K11/346
Inventor FUKUKITA, HIROSHI
Owner PANASONIC CORP